Just a comment to remind that we have a socket TIME_WAIT issue
with request. See https://github.com/request/request/issues/287
FIX too many sockets in time_wait
Similar issue than https://github.com/request/request/issues/287

Adding forever parameter to request so that it re-uses http sockets
for a given host with http keep alive.

We still have a lot of sockets opened for elasticsearch...

see this blog post for a clear explanation of the timeout issue :
http://www.serverframework.com/asynchronousevents/2011/01/time-wait-and-its-design-implications-for-protocols-and-scalable-servers.html